Can you try running ‘sudo rm -rf /usr/lib/insync/xcbglintegrations’ and try running the command again?
If it still doesn’t work can you try upgrading your system packages – ‘sudo apt-get update && sudo apt-get upgrade’?
Can you send me the output of ‘ldd /usr/lib/insync/PySide2.QtCore.so’

I just tried removing the old versions and killing all insync processes and installing 1.5.2 and it fails for me on the key import as well. It seems to be running, but I haven’t tried to sync anything yet.